Local regulations complicated the stormwater best management practices (BMPs) and stream restoration for a $32 million transportation project in a highly-urbanized area within the City of Columbus, Ohio. To meet the requirements of the City’s 2012 Stormwater Drainage Manual (SWDM), the project required design, redesign, negotiation, and development of creative stormwater BMPs.
This presentation will detail the BMPs considered which include detention basins, underground storage, retrofit of hydrodynamic separator, and vegetated swales. Ultimately, an existing dry detention basin outside of the project area was retrofitted for compensatory stormwater quantity and quality control, supplemented by vegetated swales within the project area. In addition to navigating the BMPs, this project required the relocation of a small headwater stream segment “captured” within the existing roadway right-of way. This presentation will review how this minor adjustment was successfully incorporated into the project design, despite presenting significant technical, permitting, and mitigation challenges.